docs: def get_ddo(did):
      """Get DDO of a particular asset.
      ---
      tags:
        - ddo
      parameters:
        - name: did
          in: path
          description: DID of the asset.
          required: true
          type: string
      responses:
        200:
          description: successful operation
        404:
          description: This asset DID is not in OceanDB
      """
      try:
          asset_record = dao.get(did)
          return Response(_sanitize_record(asset_record), 200, content_type='application/json')
      except Exception as e:
          logger.error(e)
          return f'{did} asset DID is not in OceanDB', 404